You have done the most of your pre op thank goodness, just the last little bit to go. Everyone agrees its the worst thing they have ever done and its hard. We have to give up all the things we love to eat and the enjoyment it gives. Its why we ended up the weight we are. We love food too much. Its like having another person in our life that says only good things like - lets have a bar of chocolate or look at that yummy cake, lets get some. That voice never says no. Now I have a tiny stomach that says NO WAY, you are full girl, well old woman.
Just do your very best, take it hour by hour if necessary. You will get through this. You wont die. You will be the skinny active roll model your baby needs. We wouldn't be human if we were not scared of the unknown. There are 20 years of people on this forum who felt just like you and are now reaping the benefits of having had the surgery.
I hope you can continue to do so well, sleep as much as you can because its less time to think negative thoughts. Good luck